CDC says is recommended ariel spraying weeks before planes launched

"Was Dallas County's health commissioner slow to react to a key piece of advice from federal health officials as West Nile virus spread this summer? The NBC 5 Investigates team has learned that the Centers for Disease Control and Prevention suggested the county "strongly consider" aerial spraying for mosquitoes nearly a month before Dallas County launched the planes. In emails obtained through an open-records request, NBC 5 Investigates learned about conference calls Dallas County Health and Human Services Director Zach Thompson had with the CDC."